Aden Gillett's character, Ian Kent, has a dog. This was Aden's own dog, an Italian Spinone called Echo.
The phone number displayed on the March Magna library wall begins with the code 01632. This is a fictional code only used by the film and TV industry in the UK, much like the 555 prefix used in the US.
Jack Roth is the son of the actor Tim Roth.
Emma and Susannah Fielding are not related.
Gabrielle Lloyd previously appeared in Who Killed Cock Robin? She returns in the story Saints and sinners alongside Aden Gillett who also appears in this episode.